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Groups > linux.debian.kernel > #72427

Bug#961401: Sequence of module loading is relevant

Cross-posted to 2 groups.

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Dear Maintainers,

recently I found out that scanner communication is dependent on the
sequence of loading of the two kernel modules ehci-hcd and uhci-hcd.

This sequence may, in normal day-by-day boot procedures, differ. Thus,
the scanner communication fails sometimes; Or, to tell the truth, it
fails more often than it works.

As I managed to make the scanner work by unloading all kernel modules
(rmmod) and afterward loading (modprobe) them manually, I made
variations of the loading sequence.

Meanwhile I found out, that the most simple way to establish
communication with the scanner on the USB bus is to unload only
ehce-hcd and uhci-hcd followed by loading first ehci-hcd and then
uhci-hcd.

Probably this helps you to analyse the problem and serves others who
have similar problems with USB devices as a workaround.

Best regards
Markus Hiereth

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Bug#961401: Sequence of module loading is relevant Markus Hiereth <translation@hiereth.de> - 2021-07-22 19:10 +0200

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